Formation of stay-heads used in locomotive fire-boxes, &amp;c.



- A. C. ROGERSON. FORMATION OE STAY HEADS USED IN LOOOMOTIVE EIEE BOXES, dw. APPLICATION FILED JULYZ?, 1911.

1,050,232, Patented Jan.14,1913.

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ALBERT cHoRLEY Roar- 250m PLANNER/(PN C0.. WASMINCITDN. D. C.

UNITED STATES PATENT OFFICE.

ALBERT CHORLEY ROGERSON, OF MANCHESTER, ENGLAND, ASSIGNOR OF ONE-HALF TO ARTHUR FREDERICK HALSTEAD, OF MANCHESTER, ENGLAND.

FORMATION OF STAY-HEADS USED IN LOCOMOTIVE FIRE-BOXES, &C.

To c/[Z ywhom. 2f may Conce/rn.'

Be it known that I, ALBERT CHoRLEY Roan-uson, a subject of the King of Great Britain and Ireland, residing at Annandale House, Victoria Park, Manchester, in the county7 of Lancaster, England, works manager, have invented new and useful Improvements in the Formation of Stay-Heads Used in Locomotive Fire-Boxes and Such Like, of which the following is a specification.

The invention relates to a particular shape of head for water space stays such. as are applied in connection with locomotive fire boxes, boilers, furnaces, &c.

Thc new shape of stay head is of a pre- `cise form having a comparatively flat top and steep sides, and in which the fibers of the metal are rolled over and assume a curved disposition, while the shaped head is brought very close down on the plate.

The shape of the stay head is got by means of a particular form of tool. It is found that by the use of such a tool as will be hereafter described, not only are the fibers of the metal rolled over and caused to distribute themselves in curved lines as indicated in Figure 1 of the drawings, butthe head is caused to bed closely down and all around as regards its annular meeting edge upon the plate as the figure shows, and this close junction enables the stay head to better resist thermal erosion and gives a stay head of much greater strength. Further, the stay head is not cracked around the annular junction edge with the plate which is a common defect with other forms of riveted stay head, because with my improved form of tool. the metal follows the path of least resistance and is gradually rolled over by the repeated action of the hammer and the tool.

Referring now to the accompanying drawings, Fig. 1 shows in section the precise shape of the new stay head or the like, and clearly indicates the curved or arching disposition of the fibers whereby a better stay head results and the metal is brought down close to the plate of the fire-box. Fig. Q- shows in section on a smaller scale the two plates of @locomotive fire-box with a stay, one endof such stay having been riveted to the desired shape by the improved tool. Fig. 3 shows in section the shape ofthe head when just formed by the tool. Fig. 4 is a Specification of Letters Patent.

Application filed July 27, 1911.

Patented Jan. 14,1913.

Serial No. 640,891.

longitudinal section of the tool. Fig. 5 is a face view thereof. Figs. 6 and 7 are similarly a longitudinal section and face view of the tool with a modification.

The tool for forming the stay head is marked a and is forced on or-ixed to a shank which is inserted in the neck c in connection with the cylinder of a pneumatic hammer or percussive tool of suitable kind.- The operative end of the tool is fashioned with three forming or pressing prongs a', a', a set at an angle of 120O to each other, but more than three such prongs may be used. The axis of the tool is bored out to provide a passage e. The design of the operative end of the tool and the prongs a is such that the tool will finish the stay head to the desired shape. The stay head is not hemispherical but is nearly flat or only slightly arched on the crown and steeply curved at the sides as shown in Figs. 1 and 2. The steepness of the sides atf act as a guide for the pronged tool making it self centering. The operator applies the tool to the projecting head of the stay, the prongs insuring a proper engagement, and during the repeated blows of the penumaticA harnmer upon the tool rotates the tool first in one direction and then the other by means of the attached handle g. The prongs a form the steep sides of the stay head, and as soon as these sides begin to assume shape they guide the prongs to form the desired shape of head concentric with the axis of the stay. This desired formation of head is assisted as the inner curved part Iz, of the tool is forming the dome of the head, by metal of the stay being forced into the hole e of the tool, which forms a small pap z' in the center of the stay head, temporarily blocking up the passage j in the end of the stay where such passage is used, as shown in Fig. 3. This pap z' as it enters the hole e in the tool serves to guide the tool in addition to the guiding effect due to the peculiar shape of the stay head, and the pap is afterward cut off, leaving the stay head .of the shape shown in Figs. 1 and 2. Any excess of metal after the stay head has been formed may form a tin around the head, which could be cut off by beveling the edges of the prongs a', or the prongs need not be beveled and the tin may be removed by a suitable tool.

When forming a head as shown in Fig. 1

the steeply curved sides f of the stay head serve in themselves to guide the tool when they begin to assume shape so that the pro` vision of further guiding means such as is afforded by the center hole e in the tool is not essential to the success of the operation. In Figs. G and 7 the tool is shown Without Suchl center hole '6, and the stay head is formed at once in the shape shown in Figs. 1 and 2 Without the center pap z', and Without the necessity of subsequently removing the pap. Otherwise the construction of the tool and the method of using it, to obtain the formation of the desired shape of stay head is the same as already described. The

stay referred to may be of'copper, brass, steel, iron or other metal or alloy.

I declare that What I claim is.

A stay provided with a head having a substantially flat top surface and steeply 20 curved sides, the fibers of the metal in the head being curved outwardly and downwardly with respect to the iibers in the stay.

In testimony whereof I have signed my naine to this speciiication in the .presence of 25 two subscribing witnesses.

ALBERT CHORLEY ROGERSON. W'Yitnesses ALFRED STUART Yn'rns, NORMAN KIERNAN.

Ccpies ot this patent may ne obtained for ve cents each, by addressing the Commissioner cf Patents,

Washington, D. C. 

